CN201100780Y - Compression-absorption hybrid refrigerator - Google Patents

Abstract

The utility model discloses a compression-absorption hybrid refrigerator, which comprises a mechanical compression refrigerator system and a lithium bromide absorption refrigerator system. In the mechanical compression refrigerator system, one end of the condenser is connected with the compressor, and the other end It is connected to the evaporator through an expansion valve; in the lithium bromide absorption refrigerator system, one end of the generator is connected to the second condenser, and the other end is connected to the absorber through a heat exchanger and a throttle valve, and the mechanical compression refrigerator system is connected to the second condenser. The lithium bromide absorption refrigerator system is connected through a heat collection system; the heat collection system heats the lithium bromide solution in the generator with the heat generated by the condenser and compressor. The utility model combines the lithium bromide absorption refrigerator system and the mechanical compression refrigerator system together, and uses the heat generated by the mechanical compression refrigerator system to heat the lithium bromide solution in the lithium bromide absorption refrigerator system, which not only saves energy, And the cooling effect is good.

Description

Compression-absorption hybrid refrigerator

technical field

The utility model relates to a refrigeration air conditioner, in particular to a compression-absorption hybrid refrigerator which combines a lithium bromide absorption refrigerator system and a mechanical compression refrigerator system.

Background technique

Existing refrigerating and air-conditioning systems include mechanical compression refrigerating systems and lithium bromide absorption refrigerating systems.

Compression refrigerators are composed of compressors, condensers, evaporators, expanders or throttling mechanisms and some auxiliary equipment. The compressor is its core equipment, a refrigerator that relies on the compressor to increase the pressure of the refrigerant to achieve a refrigeration cycle. Its working principle is: the high-pressure steam discharged from the compressor is condensed into a liquid by releasing heat through the condenser. Then, the liquid refrigerant is throttled by the expansion valve, the pressure and temperature decrease at the same time, enters the evaporator, absorbs the heat of the brine (used to recool the object to be cooled) and evaporates into steam. Then, the vapor enters the compressor to continue compressing, and the cycle repeats.

The refrigerant of this type of refrigerator can be liquefied at room temperature and ordinary low temperature, and the refrigerant condenses and evaporates periodically during the operation of the refrigerator.

The lithium bromide absorption refrigerator uses water as the refrigerant and lithium bromide aqueous solution as the absorbent to produce low-temperature water above 0°C, which is mostly used in air conditioning systems. The LiBr absorption chiller system works as follows:

Lithium bromide has strong water absorption, but the solubility of lithium bromide in water decreases with the decrease of temperature. The water vapor partial pressure of lithium bromide aqueous solution is much smaller than the saturated vapor pressure of pure water at the same temperature, so under the same pressure, lithium bromide aqueous solution has the ability to absorb water vapor at a temperature much lower than it, which is lithium bromide absorption refrigeration The mechanism of the machine. In fact, the method of heating the dilute solution is used to make it boil, so as to obtain distilled water for continuous evaporation. The system consists of generator, condenser, evaporator, throttle valve, pump and solution heat exchanger etc. Before the dilute solution is heated, the pressure is raised by a pump, so that the vapor generated by boiling can be condensed at room temperature. The pressure differential between the generator and condenser (high pressure side) and the evaporator and absorber (low pressure side) is maintained by expansion valves or other throttling mechanisms installed on the corresponding piping. The temperature of the concentrated solution leaving the generator is relatively high, while the temperature of the dilute solution leaving the absorber is considerably lower. The concentrated solution cannot absorb water vapor until it is cooled to the temperature corresponding to the pressure of the absorber, and the dilute solution must be heated to the saturation temperature corresponding to the pressure of the generator before it starts to boil, so it passes through a solution heat exchanger , so that the concentrated solution and the dilute solution exchange heat with each other before entering the absorber and the generator respectively, so that the temperature of the dilute solution increases and the temperature of the concentrated solution decreases. In summary, the working process of lithium bromide absorption refrigerator can be divided into two parts:

(1) The refrigerant vapor generated in the generator is condensed into refrigerant water in the condenser, enters the evaporator through the throttling mechanism, and evaporates under low pressure to produce a cooling effect.

(2) The concentrated solution flowing out of the generator is depressurized and enters the absorber to absorb the refrigerant vapor generated by the evaporator to form a dilute solution. The dilute solution is transported to the generator by a pump and reheated to form a concentrated solution. The above cycle is carried out repeatedly in this way, and the purpose of producing low-temperature cold water is finally achieved.

The existing two refrigeration and air-conditioning systems all need to consume a large amount of electric energy and heat energy during work. On the one hand, the generator of the lithium bromide absorption refrigerator system needs to heat the lithium bromide solution at high temperature; on the other hand, the condenser of the compression refrigerator needs to discharge a large amount of heat to the outside. Due to the failure to make reasonable use of energy, a large amount of energy is lost.

Contents of the invention

In order to save energy and reduce energy loss, the purpose of this utility model is to provide a compression-absorption hybrid refrigerator, which combines a lithium bromide absorption refrigerator system and a mechanical compression refrigerator system together, and utilizes mechanical The heat generated by the compression refrigerator system heats the lithium bromide solution in the lithium bromide absorption refrigerator system, which not only saves energy, but also has a good cooling effect.

The purpose of this utility model is through the following technical solutions

A compression-absorption hybrid refrigerating machine, including a mechanical compression refrigerating machine system and a lithium bromide absorption refrigerating machine system, wherein the mechanical compression refrigerating machine system includes a compressor, a condenser, an evaporator and an expansion valve, and one end of the condenser It is connected to the compressor, and the other end is connected to the evaporator through an expansion valve; the lithium bromide absorption refrigeration system includes a generator, a second condenser, a second evaporator and an absorber, one end of the generator is connected to the second condenser, and the other One end is connected to the absorber through a heat exchanger and a throttle valve, and it is characterized in that: the mechanical compression refrigerator system and the lithium bromide absorption refrigerator system are connected through a heat collection system; the heat collection system connects the condenser and the compressor The heat generated heats the lithium bromide solution in the generator.

On the one hand, since the condenser and compressor of the mechanical compression refrigeration system will emit a large amount of heat, the heat is directly discharged into the air during current use, which not only causes energy waste, but also pollutes the environment. On the other hand, the generator in the lithium bromide absorption refrigerator system needs to heat the lithium bromide solution, which consumes energy. In the utility model, the heat collection system is a heat transfer system including a compressor, a condenser and a generator together. The condenser and the compressor in the system are a heat source, which can be connected to the generator using a heat transfer medium. And dissipate heat, or directly integrate the generator to transfer heat, so as to reduce heat transfer loss.

The utility model uses a large amount of heat emitted by the condenser and the compressor to directly heat the lithium bromide solution, and the heat dissipation pipe of the condenser is the heater in the generator. In this way, it not only saves energy, but also reduces the impact on the environment. pollute.

The heat collection system of the utility model heats the generator in the lithium bromide absorption refrigerator system with the heat generated by the condenser and the compressor of the mechanical compression refrigerator system during the gas compression process, thereby making the lithium bromide absorption refrigerator work. Compared with the prior art, the utility model can make the lithium bromide absorption refrigerator also start to work with only one portion of the energy used to drive the mechanical compression refrigerator, that is, both refrigerators work, which not only has a good cooling effect, but also saves energy. energy and reduce environmental pollution.

Description of drawings

Accompanying drawing is the structural representation of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

A compression-absorption hybrid refrigerator described in the utility model includes a mechanical compression refrigerator system 1 , a lithium bromide absorption refrigerator system 2 and a heat collection system 3 . Wherein, the mechanical compression refrigerator system 1 includes a compressor 11 , a condenser 12 , an evaporator 13 and an expansion valve 14 . The compressor 11 is connected with the condenser 12, and the high-pressure steam discharged from the compressor 11 releases heat through the condenser 12 to be condensed into liquid. Then, the liquid refrigerant is throttled by the expansion valve, the pressure and temperature decrease at the same time, and enters the evaporator 13, where it absorbs the heat of the brine and evaporates into steam, which produces a cooling effect on the environment. Then, the steam enters the compressor 11 to continue compressing, and so on. During this process, the compressor 11 and the condenser 12 will generate a lot of heat.

The lithium bromide absorption refrigerating machine system 2 comprises a generator 21, a second condenser 22, a second evaporator 23 and an absorber 24, one end of the generator 21 is connected with the second condenser 22, and the other end passes through a heat exchanger 25 and a joint The flow valve 26 is connected with the absorber 24. During operation, the cold water is cooled in the second evaporator 23 by the low-temperature refrigerant water after decompression and throttling from the second condenser 22, and the refrigerant water itself absorbs the heat of the cold water and evaporates to become The refrigerant vapor enters the absorber 24 and is absorbed by the concentrated solution, and the concentrated solution becomes a dilute solution. The dilute solution in the absorber 24 is sent to the heat exchanger 25 by the solution pump 27 to increase in temperature, and finally enters the generator 21, where the dilute solution is heated to become the final concentrated solution. The concentrated solution flows through the heat exchanger 25, the temperature is lowered, enters the absorber 24, drips on the cooling water pipe, absorbs the refrigerant vapor from the second evaporator 23, and becomes a dilute solution. On the other hand, in the generator 21, the water vapor generated after the lithium bromide solution is heated externally at a high temperature enters the second condenser 22 to be cooled, and after decompression and throttling, it becomes low-temperature refrigerant water and enters the second evaporator 23. Drizzle on the cold water pipe to cool the cold water entering the second evaporator 23 to achieve the purpose of refrigeration, and the above cycle is repeated like this.

In the accompanying drawing, Q1 is that in the mechanical compression refrigerator system 1, a large amount of heat generated by the compressor 11 and the condenser 12 will be imported as a heat source into the generator 21 of the lithium bromide absorption refrigerator system 2 for heating; The heat released by the liquefaction of the high-temperature refrigerant vapor from the evaporator 21 in the second condenser 22 is released; Q3 means that the refrigerant water is sprayed on the surface of the second evaporator 23 to absorb the heat of the refrigerated substance flowing through the heat transfer tube Q4 drips down from the top of the absorber 24 for the lithium bromide concentrated solution with a very strong ability to absorb refrigerant vapor, and emits heat through the cooling device flowing through the absorber 24 .

The mechanical compression refrigerator system 1 is connected with the lithium bromide absorption refrigerator system 2 through a heat collection system 3; the heat collection system 3 is a heat transfer system including a compressor 11 and a condenser 12 as well as a generator 21. In this system The condenser 12 and the compressor 11 are a heat source, and the lithium bromide solution in the generator 21 is heated. The heat collection system 3 can use the heat transfer medium 31 to connect with the generator 21 and dissipate heat, or directly integrate the generator 21 to transfer heat, so as to reduce heat transfer loss. The heat transfer medium 31 may be a heat pipe.

The utility model directly uses a large amount of heat emitted by the condenser and the compressor of the mechanical compression refrigerator system to heat the lithium bromide solution in the generator of the lithium bromide absorption refrigerator system, which not only saves energy, but also has a good refrigeration effect ,reduce environmental pollution.

Claims (2)

1. A compression-absorption hybrid refrigerating machine, comprising a mechanical compression refrigerating machine system (1) and a lithium bromide absorption refrigerating machine system (2), wherein the mechanical compression refrigerating machine system (1) includes a compressor (11) , condenser (12), evaporator (13) and expansion valve (14), one end of condenser (12) is connected with compressor (11), and the other end is connected with evaporator (13) by expansion valve (14); The lithium bromide absorption refrigerator system (2) comprises a generator (21), a second condenser (22), a second evaporator (23) and an absorber (24), and one end of the generator (21) is connected to the second condenser (22) is connected, and the other end is connected with absorber (24) through heat exchanger (25) and throttling valve (26), it is characterized in that: described mechanical compression refrigerator system (1) and lithium bromide absorption refrigerator The system (2) is connected through a heat collection system (3); the heat collection system (3) heats the lithium bromide solution in the generator (21) with the heat generated by the condenser (12) and the compressor (11). 2. The compression-absorption hybrid refrigeration machine according to claim 1, characterized in that: the heat collection system (3) uses the heat generated by the compressor (11) and the condenser (12) using the heat transfer medium (13 ) is connected with the generator (21) and dissipates heat.